Appeal No. 2002-1318
Application No. 08/693,662
alter the impedance at the receiver to tune the television to the
desired channel using the power lines as an antenna. By altering
the switches 101-106, the user effectively tunes the television
channel reception using the receiver as an alternative to an
aerial antenna to tune into an aerial broadcast signal.
Thus, the receiver alone, without the television or the
transmitting unit, has independent value as an advantageous
replacement for aerial broadcast reception at any broadcast
frequency.
From these disclosures of Dockery, we find that in the
second embodiment, the signal is broadcast over the power lines
to be received at any location within 200 feet from the power
lines, and is received through aerial reception by the receiver.
However, we find that the signal broadcast over the power lines
is originally transmitted over the power lines by the
transmitter. In addition, from the disclosure of Dockery that
amplifiers 72 and 74 of transmitter circuit 60 of transmitter 10
are RF amplifiers (col. 5, line 48) we find that Dockery
discloses the use of RF transmitters. Thus, we find that Dockery
does not suggest that the video signal is transmitted without the
use of an RF transmitter on the first power line. Moreover, in
the additional embodiment of Dockery, where the transmitter is
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